Sash counterbalancing means for window frames



Aug. 29, 1939. H. w. COOK SASH COUNTERBALANCING MEANS FOR WINDOW FRAMES Filed May 3, 1958 I 3nv'entor ,1; y v I 2 M631, '9 (Ittomeg;

Patented Aug. 29, 1939 UNITED STATES PATENT OFFICE SASH COUNTERBALANCING MEANS FOR WINDOW FRAMES 2 Claims.

This invention relates to window frames in which sliding sash having counterbalancing weights are employed.

As now commonly constructed, the pulleys over 5 which the sash suspending cords travel are journaled in the pulley stiles and project at both sides of the stile and into the weight box in such manner as to necessitate a large cross section of the weight box and an excessive plough of the sash.

One object of the invention is to provide an improved construction of pulley and head jamb whereby the pulley and its frame can beinserted upward through an opening in the head jamb and secured by a single screw at the lower side of the head jamb with the axis of the pulley at or nearly in a vertical line with the pulley stile, the said jamb being provided with a braced pulley placing socket, the brace coinciding with the pulley stile so as not seriously to impair the 20 strength of the head jamb around such socket.

Among the results of the construction is that the weight box can be made of narrower cross section than usual and thin flat weights employed to balance the sash. Moreover, from four to six inches of travel of the weights added. Further, if the weight cord becomes entangled, fast and immovable, the pulley can be removed without separating the parts of the frame.

Further objects will appear from the disclosure herein.

The invention is embodied in the example herein shown and described, the feature of novelty being pointed out in the claims.

In the accompanying drawing:

Figure 1 is a top plan view of the upper end of the frame showing one of the pulleys installed and the opening in the head jamb for the installation of the other.

Fig. 2 is a view in elevation from the inner side of the frame with parts broken out and in section of an installed pulley and the sash cord and weight.

In the views the character 9 designates the pulley stile. l designates the pulley wheel proper, it being journaled on a shaft fixed in the sides of a housing H the latter being closed at the top. l2 designates a downwardly extending leg of the housing base frame, said leg having secured to its lower end by means of a rivet or welding a face plate I3. The said plate l-i which extends in opposite directions from the leg is provided at its inner end with an opening l3 for the passage of the weight cord M at the sash side and its outer end with an opening for the insertion of a screw IE to secure the plate [3 and the pulley and its housing to the head jamb H5. The head jamb I6 is made with an opening 16* through which the pulley with its housing can be inserted for the installation and the securing of I0 those members in stalled position to the head jamb by means of the said screw l5. The extension of the base plate containing the opening l3 for the weight cord I4 is such that it abuts against the pulley stile 9 and determines the proper position of the pulley in relation to the cord opening to the weight box. The weight is shown at M and the opening in the head jamb It for the weight side of the cord is shown at Ni It will be observed that the portion of wood of the head jamb left at I 6 between the openings I6 and la forms a bridge or brace coinciding vertically with the upper contiguous edge of the pulley stile thereby avoiding weakening the end of the head jamb and providing a shallow groove for guiding the lower portion of the pulley wheel. In practice, the pulley it is first installed and the weight cord M run around the pulley and attached to the sash a portion of which is shown at IT in the usual manner.

The forms of the parts can be changed without departing from the invention as claimed.

What I claim is:

1. A pulley housing for sash counterbalancing means in a window frame having a pulley stile and a head jamb with cord openings and a bridge between them coinciding with the contiguous end of the pulley stile said housing including a hood portion to contain the pulley, said hood being open at its lower portion and having at one end thereof a downwardly extended leg of a length substantially equal to the thickness of the head jamb of the window frame, and a plate member at the lower extremity of said leg extending in opposite directions from said leg, one end of said plate member constituting a stop to determine the placement of the pulley and the other having an opening for means securing said plate member to the lower side of the head jamb of the window frame with the said hood portion supported at the upper side of the head lamb in the vertical plane of the pulley stile.

2.. A pulley housing for sash counterbalancing means in a window frame having a pulley stile and a head jamb with cord openings and a bridge between them coinciding with the contiguous end of the pulley stile, said pulley housing including a hood portion to contain the pulley, said hood being open at its lower portion where it is to rest upon the upper side of the head jamb and having at one end thereof a downwardly extended leg of a length substantially equal to the thickness of the head jamb of the window frame, and a plate member at the lower extremity of said leg extending horizontally outward from said leg and hood and provided with an opening for means securing said plate member to the lower side of the head jamb.

HARRY W. COOK. 

